/**
* Writes the altered parent tree to a PdfWriter and updates the StructTreeRoot entry.
* @param writer The writer to which the StructParents have to be written
* @throws IOException
*/
public void WriteParentTree(PdfWriter writer)
{
if (structTreeRoot == null)
{
return;
}
int[] numbers = new int[parentTree.Count];
parentTree.Keys.CopyTo(numbers, 0);
Array.Sort(numbers);
structTreeRoot.Put(PdfName.PARENTTREENEXTKEY, new PdfNumber(numbers[numbers.Length - 1] + 1));
structTreeRoot.Put(PdfName.PARENTTREE, PdfNumberTree.WriteTree(parentTree, writer));
}
/**
* Creates a list of StructuredItem objects.
* @param reader the reader holding the PDF to examine
*/
public StructureItems(PdfReader reader)
{
PdfDictionary catalog = reader.Catalog;
structTreeRoot = catalog.GetAsDict(PdfName.STRUCTTREEROOT);
if (structTreeRoot == null)
{
throw new DocumentException(MessageLocalization.GetComposedMessage("can.t.read.document.structure"));
}
// Storing the parent tree
parentTree = PdfNumberTree.ReadTree(structTreeRoot.GetAsDict(PdfName.PARENTTREE));
structTreeRoot.Remove(PdfName.STRUCTPARENTS);
// Examining the StructTreeRoot
PdfObject objecta = structTreeRoot.GetDirectObject(PdfName.K);
if (objecta == null)
{
return;
}
switch (objecta.Type)
{
case PdfObject.DICTIONARY:
LOGGER.Info("StructTreeRoot refers to dictionary");
ProcessStructElems((PdfDictionary)objecta, structTreeRoot.GetAsIndirectObject(PdfName.K));
break;
case PdfObject.ARRAY:
LOGGER.Info("StructTreeRoot refers to array");
PdfArray array = (PdfArray)objecta;
for (int i = 0; i < array.Size; i++)
{
ProcessStructElems(array.GetAsDict(i), array.GetAsIndirectObject(i));
}
break;
}
}
